The results show that the event is directly affected by the formation and evolution of southwest vortex and MCC cloud cluster which locate in the intersection region of the upper-level jet and the low-level jet.

• 结果表明：高、低空急流耦合区中西南低涡及MCC特徵云团的形成和维持是造成此次特大暴雨的直接影响系统。